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Observation of Fano resonance in silver nanocube–nanosphere dimer

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Abstract

In this paper, we perform a theoretical investigation of the plasmon coupling in silver (Ag) nanocube–nanosphere dimer using finite difference time domain (FDTD) technique. Due to plasmonic Fano resonance, we observe a pronounced dip in the absorption spectrum, which is induced by the destructive interference between the bright dipole mode from the Ag nanocube and the dark quadrupole mode from the Ag nanosphere. We study the effects on the Fano resonance by varying the dimensions of the nanocube and nanosphere, as well as the inter-surface gap distance between them. In addition, we vary the local dielectric environment surrounding the dimer and find a wide tuning in the Fano resonance line-shape. We calculate the localised surface plasmon resonance (LSPR) sensitivity of the nanocube–nanosphere dimer to the surrounding environment and find a high figure of merit (FOM) of 32.23, which indicates its promising potential as a plasmonic biosensor.

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Authors and Affiliations

  1. Department of Electrical and Electronic Engineering, BRAC University, Dhaka, Bangladesh

    Avijit Das & Md Mehedi Hasan

  2. Department of Mathematics and Natural Sciences, BRAC University, Dhaka, Bangladesh

    Arik Ahmed

  3. Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, USA

    Avijit Das

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  1. Avijit Das
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  2. Arik Ahmed
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  3. Md Mehedi Hasan
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Correspondence to Avijit Das.

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Das, A., Ahmed, A. & Hasan, M.M. Observation of Fano resonance in silver nanocube–nanosphere dimer. Pramana - J Phys 94, 128 (2020). https://doi.org/10.1007/s12043-020-01991-0

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  • DOI: https://doi.org/10.1007/s12043-020-01991-0

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